class RemoveArtistEntries < ActiveRecord::Migration
  def self.up
    change_table :releases do |t|
      t.remove :artist_id
    end

    change_table :songs do |t|
      t.remove :artist_id
    end
  end

  def self.down
    change_table :releases do |t|
      t.integer :artist_id
    end
   
    change_table :songs do |t|
      t.integer :artist_id
    end
  end
end
